16 1769-L20, 1769-L30 CompactLogix™ Controllers
Publication 1769-IN047C-EN-P - April 2003
Troubleshoot the Controller Using the LEDs
Indicator Color/Status Description
RUN Off No task(s) running
Controller in Program mode
Green One or more tasks are running
Controller is in the Run mode
FORCE Off No forces enabled
Amber Forces enabled
Amber Flashing One or more input or output addresses have been forced to an On
or Off state, but the forces have not been enabled
BAT Off Battery supports memory
Red Battery may not support memory, replace battery
OK Off No power applied
Green Controller OK
Red flashing Recoverable controller fault
Red Non-recoverable controller fault:
Cycle power. The OK LED should change to flashing red.
If LED remains solid red, replace the controller.
I/O
Off
(1)
(1) If the controller does not contain an application (controller memory is empty), the I/O indicator will be off.
No activity
No I/O or communications configured
Green Communicating to all modules
Green flashing One or more modules not responding
Red flashing Not communicating to any modules
DCH0 Off User-configured communications active
Green Default communication configuration active
Channel 0 Off No activity
Green Network activity (DH485)
Green flickering Data is being received or transmitted (DF1)
Channel 1 Off No activity
Green Network activity (DH485)
Green flickering Data is being received or transmitted (DF1)
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